Protective mask system



FIG. 1 is a front perspective view of an embodiment of a protective mask system according to our invention,

FIG. 2 is a front elevational view of the design shown in FIG. 1,

FIG. 3 is a right side elevational view of the design shown in FIG. 1, the left side being a mirror image thereof,

FIG. 4 is a top plan view of the design shown in FIG. 1,

FIG. 5 is a bottom view of the design shown in FIG. 1,

FIG. 6 is a front perspective view of a second embodiment of a protective mask system according to our invention,

FIG. 7 is a front elevational view of the design shown in FIG. 6,

FIG. 8 is a right side elevational view of the design shown in FIG. 6, the left side being a mirror image thereof,

FIG. 9 is a top plan view of the design shown in FIG. 6,

FIG. 10 is a bottom view of the design shown in FIG. 6,

FIG. 11 is a front perspective view of a third embodiment of a protective mask system according to our invention,

FIG. 12 is a front elevational view of the design shown in FIG. 11,

FIG. 13 is a right side elevational view of the design shown in FIG. 11, the left side being a mirror image thereof,

FIG. 14 is a top plan view of the design shown in FIG. 11,

FIG. 15 is a bottom view of the design shown in FIG. 11,

FIG. 16 is a front perspective view of a fourth embodiment of a protective mask system according to our invention,

FIG. 17 is a front elevational view of the design shown in FIG. 16,

FIG. 18 is a right side elevational view of the design shown in FIG. 16, the left side being a mirror image thereof,

FIG. 19 is a top plan view of the design shown in FIG. 16; and,

FIG. 20 is a bottom view of the design shown in FIG. 16.

All broken-lines appearing in the drawings form no part of the claimed design. 

We claim the ornamental design for a protective mask system, as shown and described. 